CN207779781U - A kind of gas pretreatment device of automatic switchover - Google Patents

Abstract

An automatic switching gas pretreatment device, including a production reactor, a cooler, a gas-liquid separation tank, a three-way solenoid valve, a first flow meter, a first drying tank, a second flow meter, a second drying tank, and dew point measurement cylinder, dew point meter, analyzer, condensate tank, liquid level gauge, delivery pump and multiple drain valves, the production reaction kettle, cooler and gas-liquid separation tank are connected in sequence; the gas outlet of the gas-liquid separation tank and the three-way solenoid valve connection; the first drying tank is connected with the three-way solenoid valve through the first flowmeter, and the first drying tank is connected with the dew point measuring cylinder through the check valve to form a gas drying branch; the second drying tank is connected through the second flowmeter and the three-way solenoid valve. The second drying tank is connected with the dew point measuring cylinder through the check valve to form another gas drying branch. The utility model automatically detects and switches the gas drying branch to ensure that the gas entering the online gas analysis instrument is absolutely clean, and provides a continuous, stable, effective and reliable operating environment for the gas analysis instrument.

Description

An automatic switching gas pretreatment device

technical field

The utility model belongs to the field of industrial gas detection, in particular to an automatic switching gas pretreatment device.

Background technique

In the field of process industry, continuous online analysis of process gas in process storage tanks, pipelines, towers, kettles and other equipment is required for safe production, but often due to working conditions, the detected gas will contain oil gas, water vapor and Impurity components such as solid particles, when they enter the gas analysis instrument, they become liquid when they are cooled, and then pollute the analysis instrument and detection components so that they cannot work normally. Most manufacturers usually use the corresponding desiccant to dry the process gas before it enters the gas analysis instrument, but all desiccants have a "life", and its length depends on the temperature, humidity, and process of the environment properties of the gas. Therefore, there is no fixed cycle for replacing the desiccant, and most manufacturers tend to adopt a one-size-fits-all approach to replace the desiccant on a regular basis. However, sometimes due to large changes in temperature, humidity, and production conditions, the gas analysis instrument is contaminated before the desiccant can be replaced. In process production, most online gas analysis instruments are equipped with interlock protection. If the pretreatment environment is not effectively monitored, it will bring great potential hidden dangers to the safe production of the process.

Contents of the invention

The purpose of this utility model is to solve the above problems and provide a gas pretreatment system capable of automatic switching, which is used for gas drying and on-line detection.

The technical solution of the utility model is an automatic switching gas pretreatment device, including a production reaction kettle, a cooler, a gas-liquid separation tank, a three-way solenoid valve, a first flow meter, a first drying tank, a second flow meter, A second drying tank, a dew point measuring cylinder, a dew point meter, an analyzer, a condensate tank, a liquid level gauge, a delivery pump and a plurality of drain valves, the dew point measuring cylinder is provided with a dew point meter; the condensate tank is provided with a liquid level meter; the production reaction kettle, cooler and gas-liquid separation tank are connected in sequence; the gas outlet of the gas-liquid separation tank is connected to the three-way solenoid valve; the first drying tank is connected through the first flowmeter and an outlet of the three-way solenoid valve, and the second One drying tank is connected with the dew point measuring cylinder through a check valve to form a gas drying branch; the second drying tank is connected through the second flowmeter and the other outlet of the three-way solenoid valve to form another gas drying branch; The drying tank is connected to the dew point measuring cylinder through the check valve; the dew point measuring cylinder is connected to the analyzer; Condensate tank connection. The condensate tank is connected to the bottom of the production reactor through a delivery pump.

Further, the output end of the dew point meter is electrically connected to the input end of the three-way solenoid valve.

Further, the control end of the delivery pump is electrically connected to the output end of the liquid level gauge.

Preferably, the cooler is a shell and tube heat exchanger.

Preferably, the first flowmeter and the second flowmeter are respectively adjustable remote rotameters.

Preferably, the liquid level gauge is a remote liquid level gauge.

Preferably, the delivery pump is a variable frequency delivery pump.

The working principle of the utility model: the device has two gas drying branches, and the three-way solenoid valve switches between the two gas drying branches. When the dew point meter dew point exceeds the set dew point threshold, the three-way solenoid valve automatically switches to Another gas drying branch circuit generates an alarm signal to prompt the production management personnel to detect and process the drying tank.

The beneficial effects of the utility model are: the automatic detection and switching of the gas drying device ensures that the gas entering the online gas analysis instrument is absolutely clean, and provides a continuous, stable, effective and reliable operating environment for the online gas analysis instrument.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Figure 1 is a schematic diagram of the structure of the utility model.

In the figure: production reactor 1, cooler 2, gas-liquid separation tank 3, three-way solenoid valve 4, first flow meter 5, first drying tank 6, second flow meter 7, second drying tank 8, dew point measurement Tube 9, dew point meter 10, analyzer 11, condensate tank 12, liquid level gauge 13, delivery pump 14.

Detailed ways

As shown in Fig. 1, in the present embodiment, a kind of automatic switching gas pretreatment device comprises production reactor 1, cooler 2, gas-liquid separation tank 3, three-way solenoid valve 4, first flow meter 5, first Drying tank 6 , second flow meter 7 , second drying tank 8 , dew point measuring cylinder 9 , dew point meter 10 , analyzer 11 , condensate tank 12 , liquid level gauge 13 , and delivery pump 14 . Cooler 2 is a shell and tube heat exchanger. The three-way solenoid valve 4 is a two-position three-way solenoid valve. The first flowmeter 5 and the second flowmeter 7 are adjustable remote rotameters. The liquid level gauge 13 is a remote liquid level gauge. The delivery pump 14 is a frequency conversion delivery pump.

The dew point measuring cylinder 9 is provided with a dew point meter 10; the condensate tank 12 is provided with a liquid level gauge 13; the production reaction kettle 1, the cooler 2 and the gas-liquid separation tank 3 are connected in sequence; the gas outlet of the gas-liquid separation tank 3 and the three-way electromagnetic The valve 4 is connected; the first drying tank 6 is connected with the three-way solenoid valve 4 through the first flowmeter 5; the first drying tank 6 is connected with the dew point measuring cylinder 9 through the check valve; the dew point measuring cylinder 9 is connected with the analyzer 11; The device 2, the gas-liquid separation tank 3, the first drying tank 6, the second drying tank 8, the dew point measuring cylinder 9 and the analyzer 11 are respectively connected to the condensate tank 12 through the drain valve. The second drying tank 8 is connected to the three-way solenoid valve 4 through the second flow meter 7 ; the second drying tank 8 is connected to the dew point measuring cylinder 9 through the check valve. The output end of the dew point meter 10 is electrically connected to the input end of the three-way solenoid valve 4 . The control end of the delivery pump 14 is electrically connected to the output end of the liquid level gauge 13 .

The sample gas is extracted from the production reactor 1, and first enters the cooler 2, and the condensate is discharged into the condensate tank 12 through the bottom drain valve, and the sample gas after heat exchange enters the gas-liquid separation tank 3 from the top, and the condensate passes through the bottom The drain valve discharges into the condensate tank 12, and the cooling medium is selected according to the physical and chemical properties of the sample gas to ensure that the sample gas components will not be destroyed.

The sample gas enters the three-way solenoid valve 4 after passing through the gas-liquid separation tank 3 . The sample gas enters the first drying tank 6 or the second drying tank 8 after passing through the three-way solenoid valve 4, and the gas flow in the gas drying branch circuit is controlled by the first flow meter 5 or the second flow meter 7, and the drying in the drying tank The desiccant is selected according to the properties of the measured sample gas medium to ensure that the desiccant will not destroy the components of the measured sample gas.

The sample gas enters the dew point meter 10 after passing through the drying system. When the dew point in the sample gas exceeds the dew point threshold set by the dew point meter 10, the current drying system needs to be checked and processed. The output signal of the dew point meter 10 is connected to the input signal of the three-way solenoid valve 4 Signal association, so that the gas outlet of the three-way solenoid valve 4 is automatically switched to another gas drying branch, and the alarm signal is transmitted to the main control room. Confirm the reset and put it into use. When the drying effect of another drying tank decays to a certain extent, it can also be automatically switched back.

Cooler 2, gas-liquid separation tank 3, first drying tank 6, second drying tank 8, dew point measuring cylinder 9, and analyzer 11 will all produce a certain degree of condensate. In order to ensure the recycling of condensate and sample tail gas, each The bottom of the equipment is equipped with a condensate drain valve, preferably a float type condensate drain valve. When the condensate in the pipeline reaches a certain level, the valve will automatically open for draining, and the valve will automatically close when the condensate is drained.

The condensate in each container is discharged to the condensate tank 12. The condensate tank 12 is equipped with a remote liquid level gauge 13. The condensate in the condensate tank 12 is transported to the sample gas production reactor 1 through the delivery pump 14. The control end of the delivery pump 14 is connected to the The electric signal output terminal of the remote liquid level gauge 13 is connected to form a closed loop, and the liquid level of the condensate tank 12 is controlled within a required range, so as to achieve the purpose of energy saving and environmental protection.

Claims (7)

1. a kind of gas pretreatment device of automatic switchover, including production reaction kettle（1）, cooler（2）, knockout drum (3), Three-way magnetic valve (4), first flowmeter (5), the first drying chamber (6), dew point measurement cylinder (9), dew point hygrometer (10), analyzer (11), lime set tank (12), liquid level gauge (13), delivery pump (14) and multiple condensate drain valves, it is characterised in that, further include second flowmeter (7), the second drying chamber (8) are provided with dew point hygrometer (10) in the dew point measurement cylinder (9)；The lime set tank (12) is provided with liquid Position meter (13)；Production reaction kettle (1), cooler (2) and knockout drum (3) are sequentially connected；The gas of knockout drum (3) goes out Mouth and three-way magnetic valve (4) connection；First drying chamber (6) connects through first flowmeter (5) and the one outlet of three-way magnetic valve (4) It connects, the first drying chamber (6) is connected through check-valves and dew point measurement cylinder (9), forms a gas dry branch；Second drying Tank (8) is through second flowmeter（7）And three-way magnetic valve（4）Another outlet connection, the second drying chamber（8）Through check-valves and dew Point measuring cylinder（9）Connection forms another gas dry branch；Dew point measurement cylinder (9) and analyzer (11) connection；Cooler （2）, knockout drum（3）, the first drying chamber（6）, the second drying chamber（8）, dew point measurement cylinder（9）And analyzer（11）It passes through respectively Condensate drain valve and lime set tank（12）Connection；The lime set tank (12) is through delivery pump (14) and production reaction kettle（1）Bottom connects.

2. the gas pretreatment device of automatic switchover according to claim 1, which is characterized in that dew point hygrometer（10）Output end And three-way magnetic valve（4）Input terminal is electrically connected.

3. the gas pretreatment device of automatic switchover according to claim 1, which is characterized in that delivery pump（14）Control End and liquid level gauge（13）Output end electrical connection.

4. the gas pretreatment device of the automatic switchover according to claim 1-3 any one, which is characterized in that described cold But device（2）For tubular heat exchanger.

5. the gas pretreatment device of the automatic switchover according to claim 1-3 any one, which is characterized in that described Flow meters（5）And second flowmeter（7）Respectively adjustable teletransmission spinner flowmeter.

6. the gas pretreatment device of the automatic switchover according to claim 1-3 any one, which is characterized in that the liquid Position meter（13）For far transmission level meter.

7. the gas pretreatment device of the automatic switchover according to claim 1-3 any one, which is characterized in that described defeated Send pump（14）For variable-frequency delivery pump.